LiF Splitting Catalyzed by Dual Metal Nanodomains for an Efficient Fluoride Conversion Cathode
Yu Zhao1, Kaiyuan Wei1, Hailong Wu1
1Institute of Electronic Engineering , China Academy of Engineering Physics , Mianyang 621000 , China.
ACS Nano
|January 15, 2019
Summary
Dual-metal (Fe-Cu) catalysis significantly enhances lithium fluoride (LiF) splitting in fluoride conversion cathodes. This strategy improves capacity retention and rate performance for advanced battery applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Fluoride conversion cathodes face challenges including poor capacity retention and rate performance due to insulating LiF and slow splitting kinetics.
- Previous methods using ball-milling to blend LiF with other materials resulted in high overpotential and low current density.
Purpose of the Study:
- To develop a novel strategy for activating fluoride conversion cathodes by employing dual-metal driven LiF splitting.
- To investigate the performance enhancement of lithiated heterostructures for improved energy storage.
Main Methods:
- A dual-metal (Fe-Cu) driven LiF splitting strategy was proposed to activate the conversion reaction.
- A lithiated heterostructure (LiF/Fe/Cu) with compact nanodomain contact was synthesized and characterized.
- Electrochemical performance was evaluated, including capacity, overpotential, energy efficiency, and cycling stability.
Main Results:
- The LiF/Fe/Cu heterostructure demonstrated a substantial charge process with considerable capacity release (300 mAh g⁻¹).
- Achieved reversible capacity of 375-400 mAh g⁻¹ with high energy efficiency (76%) and significant pseudocapacitance contribution (>50%).
- Exhibited satisfactory capacity retention over 200 cycles, with energy and power densities exceeding 1000 Wh kg⁻¹ and 1500 W kg⁻¹, respectively.
Conclusions:
- Dual-metal (Fe-Cu) driven LiF splitting effectively activates fluoride conversion cathodes.
- The designed LiF/Fe/Cu heterostructure offers promising performance for next-generation batteries.
- Optimizing the conductive network is crucial for realizing the full potential of LiF-driven cathodes.
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